alternatehistory.com

I figure the best PoD to have a single global state by modern day would be before 1900, specifically the 19th century due to that being the age of truly globe spanning empires. In 1900, there were only 78 sovereign states on the planet, a number that continued to fall. So allowing for a pre-1900 PoD, what’s the most likely way to create a single world state by the modern day?
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